From 0f5767069a05ee57a9c63392c1d9290f3e7291ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E8=B5=B7=E7=91=9E?= <3148024859@qq.com>
Date: Wed, 10 Jan 2024 13:25:22 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B9=9D=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
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diff --git "a/50 \345\274\240\350\265\267\347\221\236/20230109  \345\244\215\344\271\240.md" "b/50 \345\274\240\350\265\267\347\221\236/20230109  \345\244\215\344\271\240.md"
new file mode 100644
index 0000000..0f875fc
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+++ "b/50 \345\274\240\350\265\267\347\221\236/20230109  \345\244\215\344\271\240.md"	
@@ -0,0 +1,153 @@
+```java
+package com.mdd.controller;
+
+import com.mdd.domain.Book;
+import com.mdd.domain.R;
+import com.mdd.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/books")
+public class BookController {
+    // 分别写五个方法，添加，修改，查全部，按ID删除，，按ID查单个
+
+    // controller是表现层，要实现具体的业务，就要调用业务层service
+    @Autowired
+    private BookService bookService;
+
+    //添加，
+    @PostMapping
+    public R addBook(@RequestBody Book book) {
+        Integer i = bookService.addBook(book);
+        if (i > 0) {
+            return R.success(200,"添加成功！");
+        } else {
+            return R.failure(404,"添加失败");
+        }
+    }
+
+    // 修改
+    @PutMapping
+    public R updateBook(@RequestBody Book book) {
+        Integer i = bookService.updateBook(book);
+        if (i > 0) {
+            return R.success(200,"更新成功！");
+        } else {
+            return R.failure(404,"更新失败");
+        }
+
+    }
+
+    // 查全部
+    @GetMapping
+    public R getAllBook() {
+        List<Book> allBook = bookService.getAllBook();
+        if (allBook != null)
+            return R.success(200, allBook);
+        else
+            return R.failure(404, "查询失败，没数据！");
+
+    }
+
+    // 按ID查单个
+    @GetMapping("/{id}")
+    public R getBook(@PathVariable Integer id) {
+        Book book = bookService.getBook(id);
+        if (book != null)
+            return R.success(200, book);
+        else
+            return R.failure(404, "查询失败，没有该数据！");
+    }
+
+    // 按ID查单个
+    @DeleteMapping("/{id}")
+    public R delBook(@PathVariable Integer id) {
+        Integer i = bookService.delBook(id);
+        if (i > 0) {
+            return R.success(200,"删除成功！");
+        } else {
+            return R.failure(404,"删除失败");
+        }
+    }
+}
+
+```
+
+```java
+package com.mock.mapper;
+
+import com.mock.pojo.Book;
+import org.apache.ibatis.annotations.Delete;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.Update;
+
+import java.util.List;
+
+public interface BookMapper {
+    //    查询所有
+    @Select("select id, book_name bookName, author, publisher from book order by id desc;")
+    List<Book> findAll();
+
+    //    新增
+    @Insert("insert into book (book_name, author, publisher) values (#{bookName}, #{author}, #{publisher})")
+    Integer insertBook(Book book);
+
+    //    修改
+    @Update("update book set book_name = #{bookName} , author = #{author} , publisher = #{publisher} where id = #{id} ;")
+    Integer editBook(Book book);
+
+    //    根据id查一个
+    @Select("select id, book_name bookName, author, publisher from book where id = #{id};")
+    Book findById(Integer id);
+
+    //    根据id删除
+    @Delete("delete from book where id = #{id};")
+    Integer deleteBook(Integer id);
+}
+```
+
+```java
+package com.mock.service.impl;
+
+import com.mock.mapper.BookMapper;
+import com.mock.pojo.Book;
+import com.mock.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+@Service
+public class BookServiceImpl implements BookService {
+    @Autowired
+    private BookMapper bookMapper;
+    @Override
+    public List<Book> findAll() {
+        return bookMapper.findAll();
+    }
+
+    @Override
+    public Integer insertBook(Book book) {
+        return bookMapper.insertBook(book);
+    }
+
+    @Override
+    public Integer editBook(Book book) {
+        return bookMapper.editBook(book);
+    }
+
+    @Override
+    public Book findById(Integer id) {
+        return bookMapper.findById(id);
+    }
+
+    @Override
+    public Integer deleteBook(Integer id) {
+        return bookMapper.deleteBook(id);
+    }
+}
+```
+
-- 
Gitee